Peerless-AV ACC-BPR SmartMount Bumper Accessory (Black)The SmartMount Bumper Accessory is designed to help prevent damage to doorways or walls by providing a non marring cushion at the outer corners of your Peerless AV cart base. Made from non marring rubberized material Easily attaches with two screws without having to remove the wheels from the cart Corner bumpers protect walls and doorways from damage Peerless AV ACCBPR NEW Specs Compatibility Compatible with the following Peerless AV products: SR560M,